What information about recombination frequencies enables scientists to create linkage maps?

The answer is;

Genes that are close together are more likely to be passed together to offspring during recombination. Geneticist compares the ration between the proposed phenotype offspring and actual phenotype offerings in a population. The higher the recombination frequency (centimorgans," or cM), the closer the genes are linked together, physically.

cuz some people don't have enough food. that's why we need more ppl to donate food to the hungry.